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通过热激子激发态的分子调谐调控实现的高效、无掺杂、纯蓝色荧光有机发光二极管

High-Efficiency, Non-doped, Pure-Blue Fluorescent Organic Light-Emitting Diodes via Molecular Tuning Regulation of Hot Exciton Excited States.

作者信息

Lv Xianhao, Xu Lei, Cui Wei, Yu Yuan, Zhou Huayi, Cang Miao, Sun Qikun, Pan Yuyu, Xu Yuwei, Hu Dehua, Xue Shanfeng, Yang Wenjun

机构信息

Key Laboratory of Rubber-Plastics of Ministry of Education/Shandong Province (QUST), School of Polymer Science & Engineering, Qingdao University of Science & Technology, 53-Zhengzhou Road, Qingdao 266042, P. R. China.

School of Petrochemical Engineering, Shenyang University of Technology, 30 Guanghua Street, Liaoyang 111003, P. R. China.

出版信息

ACS Appl Mater Interfaces. 2021 Jan 13;13(1):970-980. doi: 10.1021/acsami.0c15876. Epub 2020 Dec 24.

Abstract

Tremendous efforts have been made on researching triplet-triplet annihilation (TTA) and thermally activated delayed fluorescence (TADF) materials for realizing high-efficiency blue organic light-emitting diodes (OLEDs) through utilizing triplet exciton conversion to the lowest singlet excited state (S) from the lowest triplet excited state (T). However, hot exciton conversion from the upper triplet energy level state (T, > 1) to the lowest singlet excited state (S) is an increasingly promising method for realizing pure-blue non-doped OLEDs with performances comparable to those of TTA and TADF materials. Herein, two pure-blue fluorescent emitters of donor (D)-π-acceptor (A) type, PIAnCz and PIAnPO, were designed and synthesized. The excited-state characteristics of PIAnCz and PIAnPO, confirmed by theoretical calculations and photophysical experiments, demonstrated these materials' hot exciton properties. Based on PIAnCz and PIAnPO as emission layer materials, the fabricated non-doped devices exhibited pure-blue emission with Commission Internationale de l'Eclairage (CIE) coordinates of (0.16, 0.12) and (0.16, 0.15), maximum luminescences of 10,484 and 15,485 cd m, and maximum external quantum efficiencies (EQEs) of 10.9 and 8.3%. Besides, at a luminescence of 1000 cd m, the EQEs of PIAnPO-based devices can still be high at 7.7%, and the negligible efficiency roll-off was 6.0%. The device performance of both materials demonstrates their outstanding potential for commercial application.

摘要

为了通过利用三重态激子从最低三重态激发态(T)转换到最低单重态激发态(S)来实现高效蓝色有机发光二极管(OLED),人们在研究三重态-三重态湮灭(TTA)和热激活延迟荧光(TADF)材料方面付出了巨大努力。然而,从较高三重态能级状态(T, > 1)到最低单重态激发态(S)的热激子转换是实现具有与TTA和TADF材料相当性能的纯蓝色非掺杂OLED的一种越来越有前景的方法。在此,设计并合成了两种供体(D)-π-受体(A)型的纯蓝色荧光发射体PIAnCz和PIAnPO。通过理论计算和光物理实验证实的PIAnCz和PIAnPO的激发态特性表明了这些材料的热激子性质。基于PIAnCz和PIAnPO作为发光层材料制备的非掺杂器件呈现出纯蓝色发射,国际照明委员会(CIE)坐标分别为(0.16, 0.12)和(0.16, 0.15),最大发光强度分别为10484和15485 cd m,最大外量子效率(EQE)分别为10.9%和8.3%。此外,在发光强度为1000 cd m时,基于PIAnPO的器件的EQE仍可高达7.7%,可忽略不计的效率滚降为6.0%。这两种材料的器件性能表明它们在商业应用方面具有巨大潜力。

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